1 /*
2  * QEMU Generic PCIE-PCI Bridge
3  *
4  * Copyright (c) 2017 Aleksandr Bezzubikov
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
7  * See the COPYING file in the top-level directory.
8  */
9 
10 #include "qemu/osdep.h"
11 #include "qapi/error.h"
12 #include "qemu/module.h"
13 #include "hw/pci/pci.h"
14 #include "hw/pci/pci_bus.h"
15 #include "hw/pci/pci_bridge.h"
16 #include "hw/pci/msi.h"
17 #include "hw/pci/shpc.h"
18 #include "hw/pci/slotid_cap.h"
19 #include "hw/qdev-properties.h"
20 #include "qom/object.h"
21 
22 struct PCIEPCIBridge {
23     /*< private >*/
24     PCIBridge parent_obj;
25 
26     OnOffAuto msi;
27     MemoryRegion shpc_bar;
28     /*< public >*/
29 };
30 
31 #define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge"
32 OBJECT_DECLARE_SIMPLE_TYPE(PCIEPCIBridge, PCIE_PCI_BRIDGE_DEV)
33 
34 static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp)
35 {
36     PCIBridge *br = PCI_BRIDGE(d);
37     PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d);
38     int rc, pos;
39 
40     pci_bridge_initfn(d, TYPE_PCI_BUS);
41 
42     d->config[PCI_INTERRUPT_PIN] = 0x1;
43     memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar",
44                        shpc_bar_size(d));
45     rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp);
46     if (rc) {
47         goto error;
48     }
49 
50     rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp);
51     if (rc < 0) {
52         goto cap_error;
53     }
54 
55     pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp);
56     if (pos < 0) {
57         goto pm_error;
58     }
59     d->exp.pm_cap = pos;
60     pci_set_word(d->config + pos + PCI_PM_PMC, 0x3);
61 
62     pcie_cap_arifwd_init(d);
63     pcie_cap_deverr_init(d);
64 
65     rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp);
66     if (rc < 0) {
67         goto aer_error;
68     }
69 
70     Error *local_err = NULL;
71     if (pcie_br->msi != ON_OFF_AUTO_OFF) {
72         rc = msi_init(d, 0, 1, true, true, &local_err);
73         if (rc < 0) {
74             assert(rc == -ENOTSUP);
75             if (pcie_br->msi != ON_OFF_AUTO_ON) {
76                 error_free(local_err);
77             } else {
78                 /* failed to satisfy user's explicit request for MSI */
79                 error_propagate(errp, local_err);
80                 goto msi_error;
81             }
82         }
83     }
84     pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
85                      PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar);
86     return;
87 
88 msi_error:
89     pcie_aer_exit(d);
90 aer_error:
91 pm_error:
92     pcie_cap_exit(d);
93 cap_error:
94     shpc_cleanup(d, &pcie_br->shpc_bar);
95 error:
96     pci_bridge_exitfn(d);
97 }
98 
99 static void pcie_pci_bridge_exit(PCIDevice *d)
100 {
101     PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d);
102     pcie_cap_exit(d);
103     shpc_cleanup(d, &bridge_dev->shpc_bar);
104     pci_bridge_exitfn(d);
105 }
106 
107 static void pcie_pci_bridge_reset(DeviceState *qdev)
108 {
109     PCIDevice *d = PCI_DEVICE(qdev);
110     pci_bridge_reset(qdev);
111     if (msi_present(d)) {
112         msi_reset(d);
113     }
114     shpc_reset(d);
115 }
116 
117 static void pcie_pci_bridge_write_config(PCIDevice *d,
118         uint32_t address, uint32_t val, int len)
119 {
120     pci_bridge_write_config(d, address, val, len);
121     if (msi_present(d)) {
122         msi_write_config(d, address, val, len);
123     }
124     shpc_cap_write_config(d, address, val, len);
125 }
126 
127 static Property pcie_pci_bridge_dev_properties[] = {
128         DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi, ON_OFF_AUTO_AUTO),
129         DEFINE_PROP_END_OF_LIST(),
130 };
131 
132 static const VMStateDescription pcie_pci_bridge_dev_vmstate = {
133         .name = TYPE_PCIE_PCI_BRIDGE_DEV,
134         .priority = MIG_PRI_PCI_BUS,
135         .fields = (const VMStateField[]) {
136             VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
137             SHPC_VMSTATE(shpc, PCIDevice, NULL),
138             VMSTATE_END_OF_LIST()
139         }
140 };
141 
142 static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data)
143 {
144     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
145     DeviceClass *dc = DEVICE_CLASS(klass);
146     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
147 
148     k->vendor_id = PCI_VENDOR_ID_REDHAT;
149     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;
150     k->realize = pcie_pci_bridge_realize;
151     k->exit = pcie_pci_bridge_exit;
152     k->config_write = pcie_pci_bridge_write_config;
153     dc->vmsd = &pcie_pci_bridge_dev_vmstate;
154     device_class_set_props(dc, pcie_pci_bridge_dev_properties);
155     device_class_set_legacy_reset(dc, pcie_pci_bridge_reset);
156     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
157     hc->plug = pci_bridge_dev_plug_cb;
158     hc->unplug = pci_bridge_dev_unplug_cb;
159     hc->unplug_request = pci_bridge_dev_unplug_request_cb;
160 }
161 
162 static const TypeInfo pcie_pci_bridge_info = {
163         .name = TYPE_PCIE_PCI_BRIDGE_DEV,
164         .parent = TYPE_PCI_BRIDGE,
165         .instance_size = sizeof(PCIEPCIBridge),
166         .class_init = pcie_pci_bridge_class_init,
167         .interfaces = (InterfaceInfo[]) {
168             { TYPE_HOTPLUG_HANDLER },
169             { INTERFACE_PCIE_DEVICE },
170             { },
171         }
172 };
173 
174 static void pciepci_register(void)
175 {
176     type_register_static(&pcie_pci_bridge_info);
177 }
178 
179 type_init(pciepci_register);
180